Ventilated pulley



sa, w23.

A. KIMBLEV. VENTxLATED PULLEY.

Fl LEDAMAY 12, W21

Patented Jan. 30, i923. l sllll Utili-ill Fbi? fiiitiilitbl.' Y

AUSTIN KIEIBLE, F WAUSAU, WISCONSIN, ASSIGNGR TO MARATHON ELECTRIC MFG. CO., 0F WAUSAU, WISCONSIN, A CGRPORATION OF WISCONSIN.

VENTILATED PULLEY.

Application led May 12, 1921. Serial No. 468,933.

To aZZwLom t mari/concern. y C In the construction Shown in the draw- Be it known that I, AUs'rnv lraiems, a ings, the motor 1 is operablv connected to citizen or" the United States ot America, and the fan 2 by means of the belt 3,' said moto a resident of Wausau, county ot liliarathon, being provided with a pulley ll, and the fan and State of lVisconsin, have invented cerbeing provided with a pulley 5 to receive 60 tain new and useful Improvements in Yfensaid belt. The motor is mounted on an adtilated Pulleys, of which the following is justable frame 6 comprising a stationary a specilication. base part Gand a movable part of platform This invention relates primarily to air- 7 adapted yand arranged for vertical move` cooled and artificially ventilated power ment by adjustable means 8 in the` form of a 65 transmission pulleys, and indirectly to speed screw and hand-wheel, said parts 6" and 7 regulation ot' belted motor-driven devices being hinged together at one side as indicatand means to manually adjust regulation ot ed at 7. Thedriven pulley is so related to the speed of a driven device by means or" the motor pulley that movement ot' the variable belt tension, especially in connecscrew S varies the tension of the belt, as will 70 tion with constant speed motors such `for inbe understood. l 1 stance as alternating current motors of It will be apparent that .i'the motor is either synchronous or induction type. adapted for constant speed and the driven The main objects vof the invention are to device is in the form of a fan or other conprovide im improved form ot' drat't generatsta-nt load mechanism, the tension ot' the 75 ing and seliQ ventilated pulley combining in a belt may be adjusted to run the driven dehigh degree mechanical strength and heat vice at any desiredconstant speed less than conductivity, to provide such a pulley its maximum speed, and heat will .be genadapted for high speed, and having sufiif erated by belt slip Vfriction on the pulley cient heat conductivity and radiating crown. power to avoid overheating when subjected The seit-ventilated draft generating pulro extensive belt slippage; to provide such ley -l comprises a hub 4, a crown rini 9 ses pulley in a iorm adapted to intimately recuredl-hereto as will be described, a radial late the cooling draft to its interior; and to Flange Yl0' formed on the back side of rim 9, provide a high speed motor with Such a a radial flange 11 termed on the rear end of e5 heat dissipating pulley adapted to prevent hub 4', and radial fan blades 12 disposed accumulation and transmission ot heat to between said flangesand 11. The blades and consequent overheating of the motor. 12 extend from the hub ai to theouter edges This invention is distinguished as to of the flanges 10 and 11 and are cast intestructure from the device of my Patent No. `grally therewith and support the flange 10 `90 1,372,700 of March 29, 1921, and `from my and rim 9, the latter being in spacedirelatwo copending applications having the fdertion to the hub el and concentric therewith ial Nos. 464,029 and 1,388,865, and the apto provide a housing and draft chamber 13 pended claims are limited to the present disfor the air intake and radiator member 14. closure as distinct from said patent and A plurality of draft passages 15 extend 95 other applications. from the inner end of chamber 13 and mem- ;ln illustrative embodiment of this invenber 14: outwardly between said flanges 10 tion is shown in the accompanyinfgdrawand 11 and between said blades 12. ings, in whichh The member 14 serves as a radiator proper Fig. 1 is a front elevation ot a belt-conand consists of a cellular cylinder having 100 nected motor and tan, with a manual belt an inner wall 16 and an outer wall 17 contiglitener on the motor support. nected by numerous thin webs or partitions Fig. 2 is an axial section of the motor 1S disposed radially to provide cells or paspulley on the line 2 2 ot Fig. sages 19. Said member 1d is made of heat Fig. 3 is an elevation of the draft intake conductive material such as copper or the .lO-5

end of the pulley. like. It is preferably interchangeable. In

Fig. is a. perspective view of a separately operation a strong dralt ot .air is drawn constructed cellular radiator member adaptthrough the pulley and discharged radially ed to lit snugly between the hub and rim ot past the blades 12 by centrifugal Jforce. the motor pulley. The operation is apparent from the draw- 11o ings,

and the direction of the induced draft current is indicated by arrows. The hole 20 is for the motor shaft.

The. motor pulley is usually smaller than the driven pulley, and hence the slippage naturally occurs at the motor end of the belt, but in case the driven pulley is the smaller, the pulleys are made of such materials that slippage at the motor is assured, for which purpose the driven pulley may have the face otits rim formed of material offering greater surface friction than that ofthemotor pulley.

It is apparenttliat if the fan is adjusted for slowv speed and correspondingly light load, the tension on the belt will be relatively small and consequently the bearing friction of the motor and fan Will be correspondingly small, sc that on light loads there is a saving of energy which Would otherwise be lost through the bearings of a constantly tight-belted device.

Although but one specific embodiment of this invention is herein shown and described. it is to understood that numerous details oi the construction shown may be altered or omitted Without departing` from the spirit of" this invention so defined by the following claims.

l claim:

l.. A pulley formed mainly of material having relatively low heat conductivity and provided with a heat radiator composed of material having relatively high heat conductivity, said pulley having a Jfan to induce a draft adjacent to said radiator for cooling the latter.

2. A pulley having a thinly disposed copper radiator formed and adapted to dissipate the heat generated at the rim from belt iriction7 said pulley also having a fan to ventilate said radiator.

3. A pulley comprising' a hub. a surrounding rim spaced therefrom. a radiator disposed between said lnib and rim, and means to induce a draft through said radiator.

4. ln a pulley a hub and a rim, in combination with a cylindrical radiator interposed between said hub and rim, said radiator connirising` a pair of concentric hollowv cylinders and a series of radially disposed longitudinal web members connecting said cylinders.

5. A pulley radiator of perforated cellular character conmrising` a pair et thin Wall members disposed concentriiiaally in mutually spaced relation, With thin axially disposed Webs connecting said members.

6. A pulley comprising hub and rim members disposed concentrically in spaced relation, mutually spaced dangers extending radially from said hub and rim respectively with centrifugal fan means carried thereby, and a cellular radiator disposed between said hub and rim and communicating' at one end directly with the air and at the other end with said fan means.

Signed at Chicago this 9th day ot' May,

A USTlN KMBLE. 

